JPH01132486A - Motorcycle - Google Patents

Abstract

PURPOSE: To reduce weight, and to improve maintainability by journalling one end of a cushion unit between a pair of left/right tubes descending toward a rear wheel from a steering shaft cylinder, and supporting rear arms on the other end of the cushion unit. CONSTITUTION: In a motorcycle, a rear wheel 82 is vertically movably supported on the rear end of a pair of left/right rear arms 84 having the front end journalled to a main frame 10. The main frame 10 has a pair of left/right upper tubes 14 and lower tubes 16 descending toward the rear wheel 82 from a steering shaft cylinder 12. In this case, a frame 88 is installed on the respective upper tubes 14 to be attachable so that a driver's seat 86 is installed on the upper surface of the frame 88. A cushion unit 90 is arranged on the reverse side of the driver's seat 86 to be journalled to the respective upper tubes 14 on the front end. While, the rear end of the cushion unit 90 is journalled to the rear arms 84 through a swinging arm 92 and a link 94.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a motorcycle in which a rear wheel is held movably up and down by a rear arm.

(Background of the Invention) Motorcycles are widely known in which a rear wheel is held at the rear end of a rear arm whose front end is pivotally supported by a main frame, and the rear wheel is movable up and down. This type of vehicle usually has a pair of left and right cushion units, the upper ends of which are pivoted to a seat rail integrated with the main frame, and the lower ends of which are pivoted to a rear arm. For this reason, the seat rails are subject to a large rear wheel load, and the seat rails also need to have sufficient strength, resulting in the problem that the main frame becomes heavy and, furthermore, the vehicle body becomes heavy.

On the other hand, in order to reduce the number of parts or reduce weight by using a single cushion unit, it has also been proposed to arrange the cushion unit as a single piece in the front and back under the driver's seat (for example, the Tilkens system). However, this method has a problem in that it is difficult to maintain the cushion unit and its surroundings due to the pipes that make up the main frame.

(Purpose of the Invention) The present invention was made in view of the above circumstances, and it is possible to reduce the weight of the main frame by concentrating the parts to which large loads are applied on the main frame, and also to reduce the weight of the main frame by integrating the cushion unit into one. To provide a motorcycle in which the maintainability around this cushion unit is not impaired despite the above-mentioned problems.

(Structure of the Invention) According to the present invention, this object is achieved in a motorcycle in which a rear wheel is held movably up and down by a rear arm whose front end is pivotally supported by a main frame. a main frame having a pair of left and right upper tubes that descend; a cushion unit with one end pivoted between the upper tubes and the other end supporting the rear arm; This is achieved by a motorcycle characterized in that it is provided with a seat support frame that is detachably fixed, and a driver's seat is mounted on the seat support frame.

(Embodiment) Fig. 1 is a side view of a motorcycle to which an embodiment of the present invention is applied, and Figs. Figure 4 shows IV-IV in Figure 1.
FIG. In these figures, the reference numeral 10 indicates a main frame, and this main frame 10 includes a steering shaft cylinder 1.
2, and a pair of left and right upper tubes 14.14 and lower tubes 16.16 that descend obliquely from the steering shaft cylinder 12 toward a rear wheel 82, which will be described later. In addition, the lower tube 16.
Only one side of 16 is shown in the figure. Upper tube 14.
The first half of 14 becomes tank rails 14a, 14a, and the second half is bent downward into a fishhook shape. Reference numeral 18 denotes a front and rear ■-type water-cooled engine in which the front and rear cylinders are inclined in the longitudinal direction to form a V-shape in side view.
16 and the lower end 14b of the upper tube 14.14. 20 is a radiator attached to the lower tube 16, 16, and is located in front of the engine 18.

Cooling water for the engine 18 circulates in this radiator 20,
This cooling water is cooled by the wind from the vehicle.

22 is a fuel tank, and the tank rail 14a,
It is attached so as to straddle 14a. 24 is a synthetic resin intake box, and this intake box 24 is accommodated in a recess formed on the back side of the fuel tank 22. Intake pipes 26 and 28 of the engine 18 extend upward from opposing surfaces of each cylinder, and the upper ends of these intake pipes 26 and 28 are connected to the intake box 24 with a sufficient distance maintained in the longitudinal direction.

This intake box 24 is integrally formed with a heat shield plate 30 that hangs down in front of the intake pipe 26 of the front cylinder. This heat shield plate 3
0 is the intake pipe 26 and the radiator 2, as shown in Figure 1.4.
0, and its left and right ends protrude in both directions of the vehicle. This heat shield plate 30 prevents the high-temperature running wind that has passed through the radiator 20 from directly hitting the driver's feet, and also prevents the heating of the fuel supply system disposed near the intake box 24.
Prevent troubles caused by heating of electrical components.

Reference numeral 32 denotes a battery storage box, and this battery storage box 32 is made of an oil-resistant material that does not deteriorate due to adhesion of fuel such as gasoline. This battery storage box 32 is attached to the tank rails 14a, 14a between each of the intake pipes 26, 28 so as to be hooked thereto. That is, as shown in FIG. 2.3, the battery storage box 32 includes a main body 34 and a lid 36, and an inverted fishhook-shaped projecting wall 38, 38 is integrally provided on the side surface of the main body 34, and a tank rail is provided. 14a.

14a has a bracket (40) that protrudes inward.

40 is welded to the bracket 40.40, and the projecting walls 3B, 38 are locked to a cap-shaped elastic member 42.42 fixed to the bracket 40.40. Incidentally, a protrusion 44 is formed on the bottom of the main body 34 as shown in FIG. Swinging in the front-back direction is restricted. The bottom of the main body 34 may have small holes for drainage and ventilation.

In FIG. 3, reference numeral 48 denotes a battery, which is housed within the main body 34. Reference numeral 50.52 designates an extension terminal plate, whose upper end bent at a substantially right angle is an opening 54.54 formed in the side wall of the main body 34 (only one side is shown in Fig. 2.3).
The positive and negative terminals 5 of the battery 48 are inserted into the main body 34 from
6.58 is screwed on. Also extension terminal board 50.52
The portion other than the opening 54.54 extends downward along the outer surface of the side wall of the main body 34, and its lower end serves as a terminal 60.62. That is, a port is fixed to the main body 34 so as to protrude laterally, and an extension terminal plate 50, 52 is attached to this port.
Terminals 60 and 62 are formed by screwing the lower ends of the . Note that the extension terminal plate 50.52 is covered with an insulating material 64 except for the connecting portions to the terminals 56.58.60.62 at both ends, and the opening 54.54 of the main body 34 is filled with a sealing material 66. has been done. By covering and fixing the lid 36 to the main body 34, the battery storage box 32 is sealed at least on the top and side surfaces. Note that an opening 68 for replenishing the electrolyte of the battery 48 is formed in M36;
This opening 68 is normally sealed with a removable lid 70.

In FIG. 1, 80 is a front wheel, and 82 is a rear wheel. Reference numeral 84 indicates a pair of left and right rear arms 84.84 (only one is shown in the figure), the front ends of which are connected to the main frame 10.
It is held in a pivot bearing at the rear lower part so that it can move up and down. The rear wheel 82 is held at the rear end of this rear arm 84. Reference numeral 86 denotes a vertically long driver's seat, and 88 denotes a seat support frame, which is detachably attached to the upper tube 14.14.

Reference numeral 90 designates a cushion unit disposed on the back side of the driver's seat 86, the front end of which is pivotally supported by the upper tube 14.14 via a bracket (not shown), and the rear end supported by a swing arm 92. It is attached to the shaft. This swing arm 92 has a bracket 9 welded to the upper tube 14.14.
The swing arm 92 and the rear arm 84 are connected by a link 96.

FIG. 5 is a partial cross-sectional view of the pivoted portion of the cushion unit 90 and the swing arm 92, and FIG. 6 is a side view thereof. The swing arm 92 has a pair of left and right plates 92a and 92b,
Further, an outer cylinder lOO is welded to the shaft end of the rod 98 of the cushion unit 90. Inside this outer cylinder 100 is an inner cylinder 1.
02 is attached via a buffering elastic material 104, and this inner cylinder 102 is screwed with a pin 106 passing through the plates 92a and 92b. The tip of this pin 106 is a plate material 92b
A groove 108 is formed in this protruding portion from one side of the pin 106 in the radial direction.
An engaging member 110 is engaged with the. That is, this engaging member 110 is made of a plate with a substantially oval side surface and has a substantially rectangular notch 112 that engages with the groove 108 . After the engaging member 110 engages the notch 112 into the groove 108, it is fixed to the outer surface of the plate member 92b by a pin 114.

Therefore, by unscrewing the port 114 and removing the engaging member 110, the pin 106 can be removed.

As a result, maintenance of the electrical components, engine 18, etc. disposed below the cushion unit 90 becomes possible. That is, if the seat support frame 88 is removed, and the pin 114, the engagement member 110, and the pin 106 are removed, the cushion unit) 90 will be able to rotate upward about the pivot point at its front end, and This is because electrical components and the engine 18 appear between the upper tubes 14 and 14.

7 and 8 are a partial sectional view and a side view showing other embodiments of the pivoting portion of the cushion unit 90, similar to FIG. 5.6. In this embodiment, a through hole 116 is formed in the protruding portion of the pin 106, and a retaining member 118 that is inserted into the through hole 116 is fixed to the outer surface of the plate member 92b by a port 120. Therefore, by removing the port 120, the engaging member 118, and the pier 106, the cushion unit 90 can be removed from the bracket 92.

As shown in FIGS. 5 to 8, Porto 114, 120,
The use of engagement members 110, 118 not only facilitates attachment and detachment, but also allows these parts to be reused.

(Effects of the Invention) As described above, the present invention provides one end of a cushion unit between both upper tubes of a main frame having a pair of left and right upper tubes that descend diagonally from the steering shaft cylinder toward the rear wheels. Since the rear arm is supported by the other end of the cushion unit, the load applied to the vehicle body from the rear wheels can be concentrated on the main frame, which is advantageous in terms of improving frame rigidity. Therefore, it is possible to reduce the weight of the main frame. Since the seat support frame is fixed to the left and right upper tubes across the cushion unit, it is possible to increase the left and right distance between the attachment points to the upper tube, which is suitable for increasing the strength of the seat support frame, especially in the left and right direction. At the same time, it is also possible to reduce the weight of the seat support frame. Furthermore, since the seat support frame is removable, removing it greatly improves the ease of maintenance around the cushion unit.

[Brief explanation of the drawing]

FIG. 1 is a side view of a motorcycle to which an embodiment of the present invention is applied, FIGS. 2 and 3 are a partially sectional side view and a plan view of the main parts of FIG. 1, and FIG. IV-IV in Figure 1
5 and 6 are cross-sectional views and side views of the shaft-attached portion of the cushion knee knit, and FIGS. 7 and 8 are cross-sectional views showing other embodiments of the shaft-attached portion of the cushion unit. Figure and side view. DESCRIPTION OF SYMBOLS 10... Main frame, 12... Steering shaft cylinder, 14... Upper tube, 82... Rear wheel, 84... Rear arm, 86... Driving seat, 88... Seat support frame , 90...Cushion unit. Patent applicant Yamaha Motor Co., Ltd.

Claims (1)

[Scope of Claims] In a motorcycle in which a rear wheel is held movably up and down by a rear arm whose front end is pivotally supported by a main frame, a pair of left and right upper tubes that descend obliquely from a steering shaft tube toward the rear wheels is provided. a main frame having a main frame; a cushion unit having one end pivoted between the upper tubes and the other end supporting the rear arm; and a seat removably fixed to the upper tubes across the cushion unit. 1. A motorcycle comprising: a support frame; and a driver seat is mounted on the seat support frame.